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Creating a plant-cell suspension culture involves first transferring the callus into liquid media, but there are no objective criteria for selecting the location of the callus to be transferred. In this study, inner and outer cells of Catharanthus roseus with various elicitors in solid-state cultures were differentiated by (1)H NMR (nuclear magnetic resonance) spectrometry and principal component analysis (PCA). It was found that the samples of various elicitors and relative locations could be separated in PCA-derived score plots. Especially, there was a clear separation between nontreated samples and those cotreated with silver nitrate and methyl jasmonate. Loading-plot analysis was therefore applied to data obtained from nontreated samples and those cotreated with silver nitrate and methyl jasmonate to determine the separation of major metabolites on score plots. The levels of valine, lactic acid, threonine, alanine, arginine, acetic acid, malic acid, succinic acid, citric acid, asparagine, choline, lactose, fumaric acid, phenylalanine, tryptophan, and formic acid were higher in the inner callus than in the outer callus, whereas 2-oxoglutaric acid, oxalacetic acid, sucrose, and glucose dominated in the outer callus. The results obtained in this study suggest that inner and outer calli can be differentiated by (1)H-NMR-based metabolomic analysis.

bioscience, biotechnology, and biochemistry

Metabolic Discrimination of<i>Catharanthus roseus</i>Calli According to Their Relative Locations Using<sup>1</sup>H-NMR and Principal Component Analysis

Metabolic Discrimination ofCatharanthus roseusCalli According to Their Relative Locations Using1H-NMR and Principal Component Analysis

Metabolic Discrimination ofCatharanthus roseusCalli According to Their Relative Locations Using¹H-NMR and Principal Component Analysis